BAGR-048 - Otaku older brother's friendship and sexual preferences are distorted by a bitchy younger sister, Chihira Monaka

A college otaku male starts living alone due to university entrance. His younger sister, envious of her brother, began to frequently enter and leave his room. One day, she negotiated to borrow her brother's room as a place to have sex with a friend with benefits, but was refused because friends were coming over. The troubled sister suddenly came up with a heinous idea to execute… A sadomasochistic tendency awakened as she mentally drove her brother to the brink. She mocks the sight of her brother, whose friendship was destroyed and was masochized.